6. Skull Implants
Have you ever been shocked by a strangely looking person with spikes on his head? It looks as though this is nasty but it is true that that some people have gone extra mile to do some form of body modifications that are really shocking and scary. The idea here is to have holes drilled on the head and then insert metal plugs though which spikes can be screwed.
The latest fashion of this tattoo is transdermal skull implants on which some metals are jammed into the bone in order to protect your brain from injuries from these metals. The only danger to this kind of tattoo is that there is no qualified person yet who can perform such an operation without causing injuries to your brain.